朗讯科技的光纤技术与光联网产品

通信业务量的爆炸式增长,要求不断提高网络的传输速度和交换容量。朗讯科技适时推出全波和真波光纤,Wavestar、OptiStar等DWDM系统,WaveStar LambdaRouter、WaveStar BandWidth Manager等光联网络设备,为运营商实施高速宽带铺平道路。本文详细描述了朗讯科技的新一代光纤技术及其光联网产品。     

MRP decision support to resolve part shortages and machine/labor overloads

Resolving part shortages and machine/labor overloads are challenging though often nightmarish experiences faced by an MRP planner. Even though MRP systems have helped many companies to plan their material and capacity requirements, part shortages and machine/labor overloads are still commonplace in many companies today due to unforseen circumstances such as machine breakdowns, quality problems, transportation delays and others. This paper will discuss how a planner could use the MRP system to help resolve part shortages and machine/labor overloads.     

智能化信号信息处理技术的发展与展望

本文描绘和分析了目前电子系统信号信息处理的发展概况及今后一个时期的发展趋向。智能化信号信息处理的主要技术在今后一方面向纵深发展，另一方面向集中和融合发展，从而形成综合智能化信号信息处理系统。     

EXPERIENCE WITH AND THEORETICAL MODELLING OF PARTICLE DISTRIBUTIONS FROM A CLASS 10,000 CLEANROOM

Particle data, engineering layouts, and theoretical modelling are presented for two class 10,000 cleanrooms with class 1,000 mini-environments used for advanced environmental research and development. Particle data generated from strategically selected sample points, is presented for background and controlled upsets in three dimensions in the clean room as well as in the intermediate changing room. The primary source of contamination in the clean room appears to be generated by the personnel. Although an increase in particle numbers is observed with increased traffic in the clean room, control over the environment is maintained by restricting high particle generating activities to within a separate changing room environment. A theoretical model based on application of a Gaudin-Schuhmann Law to the sparse matrices generated by standard industrial sampling methods is presented to show the particle distributions within the areas tested, as well as prediction of particle numbers outside the range sampled. Future work may include the refinement of the model to increase precision and prediction as well as expanding the model to predict particle distributions in three dimensions.     

Folate, Cognition, and Depression in the Era of Folic Acid Fortification

ABSTRACT: It has long been recognized that folate deficiency is associated with impaired cognitive function, particularly in older adults. Moreover, folate deficiency contributes to the symptoms of clinical depression and negatively influences the efficacy of antidepressant medications. The pathophysiological mechanisms by which folate deficiency influences cognition and depressive mood are not clearly understood, but may be mediated by decreased intracellular concentration of the methyl donor S-adenosylmethionine in the brain and increased concentration of the putative vascular toxin homocysteine in the blood (hyperhomocysteinemia). Folic acid fortification of flour in the United States, intended to reduce the risk of neural tube defects, has been in effect since January 1, 1998. The program has proven to be highly successful having lowered the prevalence of folate deficiency and hyperhomocysteinemia, as well as the incidence of neural tube defects. An important question is whether associations between folate status, cognition, and depression remain significant. In this presentation, the evidence supporting the relationships between folate status, cognition, and depression will be summarized. In addition, epidemiological data will be presented from the Sacramento Area Latino Study on Aging (SALSA), a community-based cohort study of physical and cognitive function in Latino Americans age 60 years and older, that indicate folate status remains a significant determinant of cognitive function and depressive mood despite the success of folic acid fortification.     

EXPERIENCE WITH AND THEORETICAL MODELLING OF PARTICLE DISTRIBUTIONS FROM A CLASS 10,000 CLEANROOM

ABSTRACT

Particle data, engineering layouts, and theoretical modelling are presented for two class 10,000 cleanrooms with class 1,000 mini-environments used for advanced environmental research and development. Particle data generated from strategically selected sample points, is presented for background and controlled upsets in three dimensions in the clean room as well as in the intermediate changing room. The primary source of contamination in the clean room appears to be generated by the personnel. Although an increase in particle numbers is observed with increased traffic in the clean room, control over the environment is maintained by restricting high particle generating activities to within a separate changing room environment. A theoretical model based on application of a Gaudin-Schuhmann Law to the sparse matrices generated by standard industrial sampling methods is presented to show the particle distributions within the areas tested, as well as prediction of particle numbers outside the range sampled. Future work may include the refinement of the model to increase precision and prediction as well as expanding the model to predict particle distributions in three dimensions.